TYo All from PA0SE

I am presently writing an article for our VERON magazine Electron  on the early radio experiments by Marconi. In these experiments spark gaps played an important role. Because I would like to perform some simple calculations on the peak power radiated by a spark transmitter I am looking for data on the break down voltage of spark gaps, consisting of two spheres.
In literature, found on the Internet, 75kV/inch is quoted but it is not stated whether this is between points or spheres and that makes a lot of difference.
Temperature and air pressure also influence break down voltage but I will forget about that, reckoning with "normal" conditions  of,
say , 20 degrees centigrade and  1000 hectopascal or whatever as reckoned as standard  barometric pressure.
Your help will be very much appreciated.

73, Dick, PA0SE
JN22GD

Send instant messages to your online friends http://uk.messenger.yahoo.com